Water And Steam Unit - NUVE OT 020 Service Manual

2.2.4. Water and Steam Unit

The steam needed for the sterilization is generated by boiling the distilled water which is taken from the
water tank to the sterilization chamber.
The pressure in the sterilization chamber is followed on the manometer.
The steam charge, steam discharge, air intake
operated as explained in the section 1.2 by the main PCB.
The sterilization chamber safety valve operates if the pressure inside the chamber exceeds 3,5 Bar and
it discharges the excess steam which leads to over-pressure.
The maximum pressure switch cuts the power of heaters when the pressure inside the chamber
exceeds 3 bar to protect the device and user. The minimum pressure switch also prevents door to open
if there is a pressure other than zero (over zero) in the chamber after the sterilization cycle and
provides safe operation. The second minimum pressure switch equipped in OT 020V is used to start
the vacuum pump after the pressure inside the sterilizator chamber drops to zero.
The components of the water and steam unit are listed below,
Reserve tank
•
Manometer
•
Water charge solenoid valve
•
Steam discharge solenoid valve
•
Condense solenoid valve
•
Vacuum line solenoid valve
•
Water pump
•
♣
Vacuum pump
•
Check valve
•
Sterilization chamber safety valve (3,5 Bar)
•
♣
This feature is valid for only OT 020V.
♣
, condense and vacuum line solenoid valves
♣
7
♣
are